This would allow hosting of multiple SSL certificates from the same server

nobody is hosting ssl certificates

It’s a boon in shared hosting environments

in webhosting environments the different hostnames have differnt
document roots aka websites aka as virtual servers

in case of a database-server (as also for a mailserver where this crazy
idea comes too each year) you have *one* dmaned server, your username
and your password - *why* do you need different hostnames for it?

to make things much more complex?
to have fun with add new clients to that cert?
to have fun find out the limit of SAN names over time?